Investigating Wittgenstein—his writings on 'language, logic, learning and looking'—are part of A Revolutionary Conversation with Lois Holzman, Wednesday, October 22 and 29; 7:15-8:45 p.m., at the East Side Institute, 119 W. 23rd [6th/7th], $135.

Anthropologist Robin Nagle, author of the excellent Picking Up: On the Streets and Behind the Trucks with the Sanitation Workers of New York City, talks trash at the Tenement Museum, October 15, 6:30pm.